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The cheapest way to travel on the day to Newport, is to get in groups of 3 or more max 9.
Buy returns to Oxford, and then buy returns from Oxford to Newport (Changing at Didcot and Swindon)
Total price £42.75.
Leaving Hwy at 08.58, you will be in Newport at 12.30.
You can possibly fit in a Wetherspoons breakfast (approx 5 mins walk) at Oxford as you have nearly an hour in the city of the 3 sided stadium, before the Didcot train departs.